Which major publishing merger, completed in 2013, created the world's largest book publisher and reduced the 'Big Six' publishing houses to the 'Big Five'?

In the world of publishing, corporate consolidation has dramatically changed the landscape of who controls our literary world. Major publishing houses have merged over the decades, creating powerful conglomerates that dominate the industry. This trivia question focuses on one of the most significant publishing mergers in recent history that sent shockwaves through the arts and literature community, reshaping how books reach readers worldwide.

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Penguin Random House (merger of Penguin and Random House)
HarperCollins and Simon & Schuster
Macmillan and Hachette Book Group
Bloomsbury and Oxford University Press